| 摘要 |
A lithium secondary battery includes: an internal electrode body including a positive electrode, a negative electrode, and a separator, the positive electrode and the negative electrode being wound or laminated via the separator, and an organic electrolyte. The active material used in the positive electrode satisfies the following relation between the average particle diameter R (.mu.m) and the specific surface area S (m2/g): 6 ~ RxS ~ 50 The amount of the acetylene black added to the positive electrode active material satisfies the following relation with the specific surface area of the positive electrode active material: 6 ~ W ~ S+5 (W ~ 10) (W is the amount of the acetylene black added to the positive electrode active material, expressed in % by weight based on the amount of the active material, and S has the same definition as given above and is expressed in m2/g.) In this lithium secondary battery, the electron conductivity of the positive electrode active material layer is improved, and the internal resistance is reduced, and discharging in large output and large current is possible. |
